From Stansted Airport train to Tottenham Hale Underground Station, Tube to London Euston, then train to Watford Junction. 1hrs 07min £36. From Stansted Airport, Coach Station line 727 bus to Heathrow Central Bus Station then line 724 bus to Watford, Clarendon Road (Unknown). 2hrs 34min £15. From Stansted Airport, Coach Station (Stansted Aprt) bus to Harlow Town Centre, Bus Station (Harlow Bus Stn) then line 724 bus to Watford, Town Hall (Unknown). 3hrs 07min £15. From London Stansted drive to Watford. 49min £10.